peanut worm

English Thesaurus

1. small unsegmented marine worm that when disturbed retracts its anterior portion into the body giving the appearance of a peanut (noun.animal)

hypernym	:	invertebrate,
definition	:	any animal lacking a backbone or notochord; the term is not used as a scientific classification (noun.animal)

member meronym	:	phylum sipuncula, sipuncula,
definition	:	peanut worms (noun.animal)